Assert that xattr support is in the kernel.

b/13445875

Verify that extended attributes (xattr) support is compiled
into the kernel. This is a prerequsite for SELinux and filesystem
capabilities. The failure to include support for extended attributes
may cause problems when upgrading to Android 4.4.

Change-Id: Ie641bf69d54486acb2c50a741e0b152898c1f961
4 files changed